Railway wagon bogie and railway wagon

ABSTRACT

A railway wagon bogie and a railway wagon are provided. The bogie includes wheel sets, side frames provided with triangular holes, a swing bolster provided with a preset hole in its body, and cross-braced rods. Cavities are formed in the side frames, symmetric around the center of the side frames, and located below the triangular holes. A connecting seat is provided in each of the cavities, and provided with a vertical mounting hole in a middle portion of the connecting seat. The cross-braced rods are elastically connected to the connecting seats through the mounting holes. In the railway wagon bogie and the railway wagon, the strength of the bogie is increased.

PRIORITY CLAIM

This application is the national phase of International Application No.PCT/CN2012/080676 filed on Aug. 29, 2012, and claims the benefit ofpriority to the Chinese Patent Application No. 201110296326.X, titled“railway vehicle bogie and railway vehicle” and filed with the stateIntellectual Property Office on Sep. 27, 2011, which is incorporatedherein by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to the railway wagon structure technology,and particularly to a railway wagon bogie and a railway wagon.

BACKGROUND OF THE INVENTION

A railway wagon used as a wheel-track transportation means generallyincludes a car body, a bogie and brake equipment. The bogie serves tosupport the car body, to guide the wagon to travel along rails, and tobear various loads from the car body and rails. The most common bogiefor the railway wagon includes one swing bolster, two side frames, twowheel sets, a spring vibration damper and brake equipment.

Generally, in order to improve the load capacity of the wagon, it isachieved mainly in two ways: one is to increase axle load; and the otherone is to decrease tare weight. Presently, due to the limitation ofrails and bridges, the axle load has substantially been increased to thelimit and is difficult to be increased any more. Therefore, theeffective load capacity is generally improved by decreasing the tareweight, thereby increasing the overall load capacity.

However, the bogie has a low anti-diamonding stiffness and a lowcritical velocity. There are many improved solutions against thedisadvantages of such bogie. One improved bogie is implemented byproviding additionally elastic cross-braced rods between the two sideframes, whereby increasing the anti-dislocation ability between the twoside frames and the anti-diamonding stiffness of the bogie. Presently,in actual application, the cross-braced rods may be arranged below theswing bolster so as to form a lower cross-braced bogie, or may bearranged such as to pass through the swing bolster to form a centralcross-braced bogie. The central cross-braced bogie is widely used due toa good safety performance and little influence on the brake equipment.The Chinese Patent ZL 200620112243.5 (Publication No. CN2910705Y)discloses a railway wagon bogie. As shown in FIGS. 1 to 3, this bogie isa central cross-braced bogie, including wheel sets 1, side frames 2, aswing bolster 3 and a cross-braced device. Two cross-braced rods 4 arecrossed in “X” shape and pass through a preset hole of the swing bolster3. The two ends of each of the cross-braced rods 4 are elasticallyconnected to the two side frames 2, so as to form a four-bar linkagemechanism. The two ends of each of the side frames 2 are supported onthe wheel sets 1 by axle box rubber and bearing adapter. Theanti-diamonding stiffness of the bogie is improved by providing a pairof cross-braced rods 4 between the two side frames 2, thus improving thedynamic performance of the wagon.

The two cross-braced rods 4 of the above central cross-braced bogie passthrough the preset hole of the swing bolster 3. The two ends of each ofthe cross-braced rods 4 are elastically connected to the supportingseats 5 on the side frames 2, respectively.

As shown in FIGS. 1 and 3, in order to enable the cross-braced rods 4 tobe connected to the side frames 2, a supporting seat 5 is welded beloweach triangular hole 6 outside the side frame 2. This supporting seat 5includes a tapered post 51, a seat plate 52 and a rib plate 53. Thecross-braced rods 4 pass through the triangular hole 6, fitted over thetapered post 51, and are then fixed with a locknut, thus beingelastically connected with the supporting seat 5. In the abovesupporting seat, the connections between the tapered post 51 and theseat plate 52, between the seat plate 52 and the rib plate 53, andbetween the supporting seat 5 and the side frame 2 are all achieved bywelding. Such a structure has the following drawbacks.

(1) Low Structural Strength:

Due to the welding, the fatigue strength of a weld joint itself is lowerthan that of the metal body. Moreover, the space for mounting thesupporting seat 5 is limited, resulting in the limitation to the lengthof the seat plate 52 and the height of the rib plate 53. As a result,the structural strength between the supporting seat 5 and the side frame2 is lower.

(2) Large Structural Pre-Stress:

The connections between various members are achieved by welding, so thatthere are many weld joints being crowded and crossed, causing a largestructural pre-stress. In use, an external force is added to thepre-stress, leading to a larger local stress.

(3) Instable Performance of Bogie:

Due to the welding operation, the quality of the weld joints cannot beensured easily, and the tapered post 51 cannot be positioned precisely.Thus, after the cross-braced rods 4 are mounted, the two side frames 2are not in a desired rectangular shape, that is, the bogie is notpositioned correctly, which is prone to cause non-uniform wear of wheelsof the same bogie.

(4) Low Strength of Side Frame:

Because each supporting seat 5 is disposed outside the side frame 2, thecross-braced rods 4 must pass through each triangular hole 6 in the sideframe 2. Therefore, the radius of the lower arc of each triangular hole6 cannot be designed to be too small so as to avoid interfering with thecross-braced rods 4. Thus, the strength of the side frames 2 isdecreased.

(5) Low Anti-Diamonding Stiffness of Bogie:

Because the supporting seats 5 are disposed outside the side frames 2,the cross-braced rods 4 are relatively long, thus reducing theanti-pressure destabilization critical force of the cross-braced rods 4.Therefore, the anti-diamonding stiffness of the bogie is decreasedindirectly.

(6) Large Occupied Space:

Because of the presence of the supporting seats 5, the total width ofthe bogie is increased. The design of bogies becomes more difficult forsome wagons with a narrower outline gauge.

(7) Great Difficulty in Assembling:

When the cross-braced rods 4 are assembled, it is required to ensure theclearance between the cross-braced rods 4 and the bottom face of thetapered post 51, and to ensure a certain force moment generated from thelocknut above the cross-braced rods 4, which is difficult. As a result,the difficulty in assembling is great.

(8) Inconvenient Maintenance:

Because the tapered post 51 is welded on the seat plate 52 and the seatplate 52 is welded on the side frame 2, it is inconvenient to replacethe tapered post 51 when the tapered post 51 is worn or its thread isdamaged.

SUMMARY OF THE INVENTION

In view of the drawbacks in the prior art, the present inventionprovides a railway wagon bogie which has an improved structural strengthand a railway wagon.

In an aspect of the present invention, a railway wagon bogie isprovided, which includes wheel sets, side frames provided withtriangular holes, a swing bolster provided with a preset hole in itsbody, and cross-braced rods.

Cavities are formed in the side frames, symmetric around the center ofthe side frames, and located below the triangular holes. A connectingseat is provided in each of the cavities, and provided with a verticalmounting hole in a middle portion of the connecting seat. Thecross-braced rods are elastically connected to the respective connectingseats through the corresponding mounting holes.

In another aspect of the present invention, a railway wagon is alsoprovided, including a wagon frame and a bogie connected to the wagonframe. The bogie is the railway wagon bogie according to the invention.

In a further aspect of the present invention, a railway vehicle bogie isfurther provided, including wheel sets, side frames provided withthrough holes, a swing bolster provided with a preset hole, andcross-braced rods.

Cavities are formed in the side frames. A connecting seat is provided ineach of the cavities, and provided with a mounting hole. Thecross-braced rods are connected to the respective connecting seatsthrough the corresponding mounting holes.

In the railway wagon bogie and the railway wagon according to thepresent invention, the strength of the bogie is increased;anti-diamonding stiffness of the bogie is improved; and it is convenientto assemble and maintain.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic view of a railway wagon bogie in theprior art;

FIG. 2 is a structural top view of the railway wagon bogie in the priorart;

FIG. 3 is a side view of the railway wagon bogie of FIG. 2;

FIG. 4 is a structural front view of a railway wagon bogie according toan embodiment of the present invention;

FIG. 5 is a top view of the railway wagon bogie of FIG. 4;

FIG. 6 is a partially sectional enlarged view of a railway wagon bogieaccording to an embodiment of the present invention;

FIG. 7 is a schematic view of a cavity in a railway wagon bogieaccording to an embodiment of the present invention; and

FIG. 8 is a partially sectional exploded view of a railway wagon bogieaccording to an embodiment of the present invention.

REFERENCE NUMERAL IN DRAWINGS

 1-wheel set  2-side frame  3-swing bolster  4-cross-braced rod 5-supporting seat 51-tapered post 52-seat plate 53-rib plate 6-triangular hole  7-cavity  8-connecting seat 81-mounting hole 9-positioning pin 10-locknut 11-elastic bush

DETAILED DESCRIPTION OF THE INVENTION

In order to make objects, technical solutions and advantages of thepresent invention become clearer, embodiments of the present inventionwill be clearly and fully described in conjunction with accompanyingdrawings below. Obviously, the described embodiments are a part of, notall of the embodiments of the present invention.

FIG. 4 is a structural front view of a railway wagon bogie according toan embodiment of the present invention; FIG. 5 is a top view of therailway wagon bogie of FIG. 4; FIG. 6 is a partially enlarged view of arailway wagon bogie according to an embodiment of the present invention;and FIG. 7 is a schematic view of a cavity in a railway wagon bogieaccording to an embodiment of the present invention. A railway wagonbogie is provided in an embodiment of the present invention, whichincludes wheel sets 1, side frames 2 provided with triangular holes 6, aswing bolster 3 provided with a preset hole in its body, andcross-braced rods 4. Cavities 7 are formed within the respective sideframes 2, and are symmetrical about the center of the side frames 2. Asshown in FIGS. 4 to 7, the cavity 7 is located below the triangular hole6; a connecting seat 8 is provided in the cavity 7; a vertical mountinghole 81 is provided in the middle portion of the connecting seat 8; thecross-braced rod 4 is elastically connected to the connecting seat 8through the mounting hole 81.

The comparison is made between the present invention and the prior art.As shown in FIGS. 1 and 3, in the prior art, since there is a limitedspace at the supporting seat 5, dimensions such as the length of a seatplate 52 and the height of a rib plate 53 cannot be too large, so thatthe structural strength between the supporting seat 5 and the side frame2 is relatively low. The railway wagon bogie according to the embodimentof the invention has no welded structure, and there is no need toconsider the effect of welding materials on stressed components, so thatthe railway wagon bogie may be made of materials with a higher strength,thereby improving the strength of the bogie. Moreover, in the railwaywagon bogie according to the embodiment of the invention, a hole isdrilled or reamed only in the connecting seat 8 provided in the cavity 7of the side frame 2, and its mounting dimension and position can thus beensured easily. Therefore, the position of the cross-braced device isaccurate and the two side frames 2 can be in the desired rectangularshape. That is, the bogie is held in place accurately so as to avoidnon-uniform wear of wheels of the same bogie. Furthermore, compared withthe prior art in which the supporting seat 5 is provided outside theside frame 2, in the present invention the connecting seat 8 is providedin the cavity 7 formed within the side frame 2, so that the cross-bracedrod 4 has a shortened length and thus has an increased anti-pressuredestabilization critical force, thereby improving the anti-diamondingstiffness of the bogie.

As shown in FIGS. 6 and 7, the connecting seat 8 is provided in thecavity 7 below the triangular hole 6 of the side frame 2. Preferably,the connecting seat 8 and the side frame 2 can be integrally formed bycasting, thereby overcoming the strength weakness in the prior art dueto the fact that the components are connected by welding.

The specific shape of the connecting seat 8 is not limited herein. Forexample, the connecting seat 8 may be configured in a hollow cylindricalshape, and the circular hole in the middle portion of the connectingseat 8 serves as the mounting hole 81. Specifically, the connecting seat8 is disposed in the cavity 7. The top of the connecting seat 8 and theside frame 2 are formed into one piece by casting. The bottom of theconnecting seat 8 may be of a suspended cylindrical structure and mayextend out of the bottom of the cavity 7 for receiving a positioningpiece. In actual machining process, a hole having a diameter less thanthat of the mounting hole 81 may be precast, and then finished bydrilling or reaming such as to achieve the desired dimensional accuracyand surface finish.

FIG. 8 is a partially sectional exploded view of a railway wagon bogieaccording to an embodiment of the present invention. On the basis of theabove embodiments, it is preferred that the bogie is provided with apositioning pin 9. One end of the positioning pin 9 is provided with astep which abuts against the bottom face of the mounting hole 81, andthe other end of the positioning pin 9 is provided with a thread whichmeshes with a locknut 10, so that the cross-braced rods 4 are pressedagainst the side frame 2. The tapered post in the prior art is replacedby the positioning pin 9. When the positioning pin 9 is worn or itsthread is damaged, it is convenient to perform disassembly andreplacement.

Further, each of the two ends of the cross-braced rod 4 is provided witha positioning hole. An elastic bush 11 with an inner hole is providedwithin the positioning hole. The inner hole of the elastic bush 11 isfitted with the positioning pin 9.

In an actual application, the upper and lower surfaces of the connectingseat 8 are flat surfaces. The cross-braced rod 4 is placed on the uppersurface of the connecting seat 8. The elastic bush 11 is disposed withineach positioning hole of the ends of the cross-braced rod 4. Thepositioning pin 9 passes through the mounting hole 81 and the hole ofthe elastic bush in the cross-braced rod 4 from bottom to top. Thelocknut 10 is mounted to the threaded end of the positioning pin 9, thusconnecting the cross-braced rod 4 with the elastic bush 11. The elasticbush 11 functions to create a certain elasticity between thecross-braced rod 4 and the side frame 2, so as to alleviate an impactforce.

It is to be appreciated that, if the provided triangular hole 6 isrelatively large, the positioning pin 9 may pass through the mountinghole 81 from top to bottom and the locknut 10 may be disposed at thelower end of the positioning pin 9 during the specific assembly. For theabove structure, the positioning pin 9 won't be lost, even in the caseof losing the nut, thereby ensuring that the cross-braced device doesn'tfail.

A railway wagon is also provided in an embodiment of the presentinvention, which includes a wagon frame and a bogie connected to thewagon frame. The bogie is the railway wagon bogie according to any ofthe embodiments of the present invention.

For the railway wagon bogie and the railway wagon according to theembodiments of the present invention, the connecting seat is provided inthe cavity of the side frame and is elastically connected to thecross-braced rod, which may overcome various defects in the prior artdue to welding, shorten the length of the cross-braced rod, and increasethe structural strength and anti-diamonding stiffness of the bogie.

In another aspect of the present invention, a railway vehicle bogie isprovided, including wheel sets 1, side frames 2 provided with throughholes 6, a swing bolster 3 provided with a preset hole, and cross-bracedrods 4. As shown in FIGS. 6 and 7, a cavity 7 is formed within the sideframe 2, and is defined by the peripheral of the side frame 2. Aconnecting seat 8 is provided in the cavity 7. In the example shown inFIG. 6, the connecting seat 8 is located below the through hole 6.However, it is to be understood that the connecting seat 8 may belocated at any appropriate position in the cavity 7, as long as thecross-braced rod 4 can be connected to the side frame 2. A mounting holemay be provided in the connecting seat 8, and the cross-braced rod maybe connected to the connecting seat 8 through the mounting hole and thusconnected to the side frame 2. Alternatively, connecting pieces wellknown in the art may also be provided on the connecting seat 8, so as toconnect the cross-braced rod 4 to the side frame 2. Certainly, therailway vehicle bogie in the aspect of the present invention mayincorporate some embodiments or features described above for the railwaywagon bogie, which will not be described in detail.

It should be noted that the above embodiments illustrate the technicalsolutions of the invention only in an exemplary manner, and are notintended to limit the present invention. Thus, it is to be appreciatedfor those skilled in the art that many improvements and modificationsmay be made to the invention without departing from the scope of thepresent invention which is defined by appended claims.

1. A railway wagon bogie, comprising wheel sets, side frames providedwith triangular holes, a swing bolster provided with a preset hole inits body, and cross-braced rods, wherein cavities are formed in the sideframes, symmetric around a center of the side frames, and located belowthe triangular holes, a connecting seat is provided in each of thecavities, and provided with a vertical mounting hole in a middle portionof the connecting seat, and the cross-braced rods are elasticallyconnected to the respective connecting seats through the correspondingmounting holes.
 2. The railway wagon bogie according to claim 1, whereinthe connecting seats and the respective side frames are formedintegrally by casting.
 3. The railway wagon bogie according to claim 1,wherein the bogie is provided with positioning pins, one end of each ofthe positioning pins is provided with a step configured to abut againsta bottom face of the corresponding mounting hole, the other end of eachof the positioning pins is provided with a thread configured to meshwith a locknut so as to fasten the cross-braced rod to the side frame.4. The railway wagon bogie according to claim 3, wherein two ends ofeach of the cross-braced rods are each provided with a positioning hole,an elastic bush with an inner hole is provided in the positioning hole,and the inner hole of the elastic bush is fitted with the positioningpin.
 5. A railway wagon comprising a wagon frame and a bogie connectedto the wagon frame, wherein the bogie is the railway wagon bogieaccording to claim
 1. 6. A railway vehicle bogie, comprising wheel sets,side frames provided with through holes, a swing bolster provided with apreset hole, and cross-braced rods, wherein cavities are formed in theside frames, a connecting seat is provided in each of the cavities, andprovided with a mounting hole, and the cross-braced rods are connectedto the respective connecting seats through the corresponding mountingholes.
 7. The railway vehicle bogie according to claim 6, wherein theconnecting seats and the respective side frames are formed integrally bycasting.
 8. The railway vehicle bogie according to claim 6, wherein thebogie is provided with positioning pins, one end of each of thepositioning pins is provided with a step configured to abut against abottom face of the corresponding mounting hole, the other end of each ofthe positioning pins is provided with a thread configured to mesh with alocknut so as to fasten the cross-braced rod to the side frame.
 9. Therailway vehicle bogie according to claim 8, wherein two ends of each ofthe cross-braced rods are each provided with a positioning hole, anelastic bush with an inner hole is provided in the positioning hole, andthe inner hole of the elastic bush is fitted with the positioning pin.10. The railway vehicle bogie according to claim 6, wherein each of thethrough holes is of a approximately triangular shape.
 11. The railwayvehicle bogie according to claim 6, wherein the connecting seats aredisposed in the respective cavities and below the corresponding throughholes.
 12. The railway vehicle bogie according to claim 6, wherein eachof the connecting seats is configured to be a hollow cylinder in shape,and a central circular hole of the cylinder is configured as themounting hole.
 13. The railway vehicle bogie according to claim 7,wherein each of the connecting seats is formed with a precast hole bycasting, a diameter of the precast hole is less than that of themounting hole, and the mounting hole is formed by further machining theprecast hole.
 14. The railway wagon according to claim 5, wherein theconnecting seats and the respective side frames are formed integrally bycasting.
 15. The railway wagon according to claim 5, wherein the bogieis provided with positioning pins, one end of each of the positioningpins is provided with a step configured to abut against a bottom face ofthe corresponding mounting hole, the other end of each of thepositioning pins is provided with a thread configured to mesh with alocknut so as to fasten the cross-braced rod to the side frame.
 16. Therailway wagon according to claim 15, wherein two ends of each of thecross-braced rods are each provided with a positioning hole, an elasticbush with an inner hole is provided in the positioning hole, and theinner hole of the elastic bush is fitted with the positioning pin.